不同有害因素对培养血管内皮细胞粘附分子及NFκB的影响

探讨引起动脉粥样硬化（AS）的一些有害因素作用脐静脉内皮细胞后，对单核细胞粘附率，VEC的白细胞粘附分子VCAM－1，ICAM－1及转录因子NFκB活性的影响，为阐明不同有害因素在AS早期发病机制中作用与机理提供依据。本文采用细胞计数法测粘附率，细胞免疫组化及ELISA法检测粘附分子表达及NFκB活化，原位杂交测VCAM－1m-RNA；结果显示，mmLDL,rNTFα均能明显增加U937细胞的粘附，粘附百分率分别为对照组的7倍和9．2倍；rTNFα可使内皮 VCAM－1，ICAM－1，和P－selectin表达显著上调，但mmLDL没有相似的作用；VEC在流体代剪切振荡流的作用下，明显上调VCAM－1mRNA及VCAM－1的表达，mmLDL,rTNFα和低剪切振荡流作用后，均可增加内皮细胞NFκB亚单位P65的核转位。     

整合素α4β1及其配体与大鼠肝肿瘤周边肥大细胞募集的关系

目的：D整合素α4β1(VLA-4)主其配体VCAM－1（vascular cell adhesion molecular-1)和FN（fibronectin)与肝肿瘤周边肥大细胞（mast cell,MC)募集的关系。方法：根据肝肿瘤周边肥大细胞数量,将18只雄性Wistar大鼠移植肝肿瘤模型进行分析,8只正常雄性Wistar大鼠作对照,用间接免疫荧光和流式细胞术检测各级一大鼠腹腔肥大细胞整合素VLA－4分子的表达水平,同时用免疫组化研究肿瘤周边肝组织血管内皮细胞和肝窦内皮细胞表面VCAM－1和肿瘤周边FN的表达。结果：不同肝肿瘤大鼠肿瘤周边浸润肥大细胞数量有明显差异。各组大鼠腹腔MC表达整合素VLA－4分子均呈阳性,肿瘤周边肥大细胞浸润较多组,其整合素α4β1表达水平也较高。肿瘤周边血管内皮和窦内皮细胞表达VCAM－1阳性。肿瘤周边沉积大量呈阳性表达的FN与须大细胞紧密相联。结论：整合素α4β1及其配体VCAM－1和FN在肝肿瘤周边肥大细胞集要作用;整合素α4β1的表达水平与肿瘤周边MC数呈平行关系。     

自身免疫性脑脊髓炎大鼠脑血管内皮细胞 VCAM-1和MHCⅡ类分子表达

目的　探讨实验性自身免疫性脑脊髓炎 (EAE)大鼠脑血管内皮细胞表面分子的改变。　方法　用免疫组织化学方法检测EAE大鼠脑血管内皮细胞上血管细胞粘附分子 1(VCAM 1)和主要组织相容性复合体 (MHC)Ⅱ类分子的表达。用MTT(四甲基偶氮唑盐 )法检测不同发病级别大鼠血清TNF和IFN γ的水平。　结果　EAE大鼠脑血管内皮细胞较对照有诱导表达的VCAM 1和MHCⅡ类分子 ,血清中存在TNF和IFN γ活性。　结论　中枢神经系统炎症状态下 ,脑血管内皮细胞表面分子发生改变 ,提示它们在EAE发病中可能起重要作用     

VCAM-1的研究进展

VCAM是一种重要的细胞粘附分子，主要表达在活化内皮细胞、上皮细胞、巨噬细胞、树突状细胞上。近年来在VCAM-1的基因和蛋白质结构、分布、基因调控、生物学作用及信号转导等方面的研究取得了较大的进展；本文对此进行综述。     

小檗碱对IL-1或TNF诱导的多形核白细胞与内皮细胞粘附的影响

目的:通过研究小檗碱对IL-1、TNF诱导的多形核白细胞(PMN)与血管内皮细胞粘附及粘附分子表达的影响,探讨小檗碱抗炎作用机制。方法:以小檗碱加IL-1、TNF处理人PMN或人脐静脉内皮细胞(HUVEC)后,用蛋白染料染色法研究小檗碱对PMN与HUVEC粘附的作用,用细胞ELISA、APAAP法研究小檗碱对细胞表面粘附分子表达的影响。结果:小檗碱与IL-1或TNF共同处理HUVEC,能抑制IL-1、TNF诱导的PMN与HUVEC间的粘附增强,且能下调由IL－1、TNF诱导的HUVEC表面粘附分子ICAM-1表达的增高;小檗碱与TNF共同处理PMN,能抑制TNF诱导的PMN与HUVEC的粘附增强,亦能降低TNF诱导的PMN表面粘附分子CD18的表达。结论:通过抑制细胞表面粘附分子的表达而抑制PMN与内皮细胞的粘附,可能是小檗碱发挥抗炎作用的机制之一。     

川芎嗪对脑血管内皮细胞粘附分子ICAM—1表达的影响

川芎嗪对脑血管内皮细胞粘附分子ＩＣＡＭ－１表达的影响△刘勇许彦钢（西安医科大学神经生物学研究中心，西安７１００６１）粘附分子与脑血管病的发生、发展及防治有关。我们曾报道细胞因子ＴＮＦ－α－和ＩＬ－１β刺激培养脑血管内皮细胞ＩＣＡＭ－１表达增加，但有关...     

内皮细胞粘附分子的研究进展

本文综述近十年来内皮细胞粘附分子的研究进展。概述了免疫球蛋白基因超家族成员中的I CAM 1,VCAM 1,PECAM 1;整合素家族中的αvβ3;及选择素家族中的E 选择素在介导内皮细胞与肿瘤细胞粘附的作用 ,从而提示内皮细胞粘附分子在恶性肿瘤细胞沿血管或淋巴管转移的作用     

整合素α_4β_1及其配体与大鼠肝肿瘤周边肥大细胞募集的关系

目的 :研究整合素α4 β1(VLA 4)及其配体VCAM 1(vascularcelladhesionmolecular 1)和FN(fibronectin)与肝肿瘤周边肥大细胞 (mastcell,MC)募集的关系。方法 :根据肝肿瘤周边肥大细胞数量 ,将 18只雄性Wistar大鼠移植肝肿瘤模型进行分组 ,8只正常雄性Wistar大鼠作对照。用间接免疫荧光和流式细胞术检测各组大鼠腹腔肥大细胞整合素VLA 4分子的表达水平 ,同时用免疫组化研究肿瘤周边肝组织血管内皮细胞和肝窦内皮细胞表面VCAM 1和肿瘤周边FN的表达。结果 :不同肝肿瘤大鼠肿瘤周边浸润肥大细胞数量有明显差异。各组大鼠腹腔MC表达整合素VLA 4分子均呈阳性 ,肿瘤周边肥大细胞浸润较多组 ,其整合素α4 β1表达水平也较高。肿瘤周边血管内皮和窦内皮细胞表达VCAM 1阳性。肿瘤周边沉积大量呈阳性表达的FN与肥大细胞紧密相联。结论 :整合素α4 β1及其配体VCAM 1和FN在肝肿瘤周边肥大细胞募集中起重要作用 ;整合素α4 β1的表达水平与肿瘤周边MC数呈平行关系     

LPS和TNF—α诱导血管内皮细胞ICAM—1蛋白表达的比较

目的和方法 采用细胞间免疫荧光染色和激光共聚焦显微镜扫描技术,研究脂多糖（LPS）和肿瘤坏死因子α（TNF－α）对人脐静脉内皮细胞（HUVEC）表面细胞间粘附分子－1（ICAM－1）表达的诱导作用。结果 与内皮细胞表明ICAM－1的基础表达相比,LPS可诱导内皮细胞表面ICAM－1表达在第8－24h显著增加,但第36h有较明显的下降;TNF－α也可诱导内皮细胞表面ICAM－1表达在第8－24h显著增加,并在36h仍维持在较高水平。LPS和TNF－α与内皮细胞ICAM－1表达之间存在剂量反应关系。结论 LPS和TNF－α可诱导血管内皮细胞ICAM－1的表达,但内皮细胞在表达ICAM－1时对LPS的长期刺激可能产生耐受性。     

粘附分子在人直肠腺癌血管内皮细胞的表达及意义

目的：检测血管内皮的细胞间粘附分子（ICAM－）1和癌胚抗原（CEA）及血小板－内皮细胞粘附分子（CD31）的表达,以探讨癌细胞血管浸润转移机理。方法：免疫组织化学方法。结果：癌周直肠组织及淋巴结的血管内皮细胞,均有ICAM－1和CEA的表达。结论：提示在癌细胞沿血管转移过程中,ICAM-1和CEA是介导癌细胞和血管内皮细胞稳定的粘附分子。尚不能确CD31在癌在细胞与血管内皮细胞相互中的地位。     

海洋放线菌素X2对CVB3感染ECV304细胞VCAM-1表达的影响

目的研究柯萨奇病毒(Coxsackievirus,CVB3)感染ECV304细胞后,血管细胞黏附分子-1(vascular cell adhesionmolecule,VCAM-1)的表达变化及海洋放线菌素X2对CVB3感染ECV304细胞VCAM-1表达的影响。方法采用MTT法检测不同浓度的海洋放线菌素X2作用病毒后的抑制情况;采用RT-PCR和FCM分别测定CVB3感染的ECV304细胞在海洋放线菌素X2作用前后不同时间点的VCAM-1的mRNA和蛋白的表达水平。结果海洋放线菌素X2在病毒吸附前对CVB3的SI为63.88。正常状态下ECV304细胞基本无VCAM-1 mRNA表达,CVB3感染ECV304细胞促进VCAM-1 mRNA表达,感染12 h达到最高峰,6～54 h时VCAM-1 mRNA水平,与细胞对照组相比CVB3感染组差异有统计学意义(P<0.05)。CVB3感染ECV304细胞后,VCAM-1蛋白表达在12～48 h显著高于正常ECV304细胞对照组(P<0.05)。海洋放线菌素X2干预后,于12～54 h降低ECV304细胞VCAM-1 mRNA的水平,12～24 h降低VCAM-1蛋白的表达,与CVB3感染组相比差异有统计学意义(P<0.05)。结论海洋放线菌素X2在病毒吸附前对CVB3具有抗病毒作用,并可下调CVB3诱导的ECV304细胞VCAM-1的mRNA水平和蛋白的表达。     

Matrix metalloproteinase inhibitor regulates inflammatory cell migration by reducing ICAM-1 and VCAM-1 expression in a murine model of toluene diisocyanate-induced asthma

BACKGROUND: Matrix metalloproteinase-9 (MMP-9) has been reported to play a crucial role in the transmigration of neutrophils, lymphocytes, and eosinophils. Neutrophils, eosinophils, and lymphocytes migrate from the blood to the lungs in response to inflammatory mediators produced in the airways and are subsequently released into the circulation. This traffic is mediated by adhesion molecules. However, little is known about the migration of inflammatory cells through the endothelial and epithelial basement membranes in toluene diisocyanate (TDI)-induced asthma. OBJECTIVES: An aim of this study was to evaluate the effect of MMP inhibitors on the expression of ICAM-1 and VCAM-1 in the migration of inflammatory cells in a murine model of TDI-induced asthma. METHODS: We used a murine model to investigate TDI-induced asthma to examine the possible involvement of ICAM-1 and VCAM-1 in the pathogenesis of that disease and the effect of MMP inhibitors on the expression of ICAM-1 and VCAM-1. RESULTS: In mice, the following typical pathophysiologic features develop in the lungs: increased numbers of inflammatory cells and increased expression of MMP-9, ICAM-1, and VCAM-1 mRNA and protein. Administration of MMP inhibitors reduced the increased numbers of inflammatory cells and the increased expression of ICAM-1 and VCAM-1 mRNA expression and protein. In addition, MMP inhibitors significantly abrogated the increased expression of IL-1beta, IL-4, and TNF-alpha mRNA in lung tissues and levels of IL-1beta, IL-4, and TNF-alpha in bronchoalveolar lavage fluids after TDI inhalation. CONCLUSIONS: These results suggest that MMP inhibitors regulate inflammatory cell migration by reducing ICAM-1 and VCAM-1 expression and possibly also by suppressing IL-1beta, IL-4, and TNF-alpha expression.     

四逆汤对同型半胱氨酸损伤的EAhy926细胞caveolin-1和eNOS表达的影响

 目的：探讨四逆汤（Sini decoction,SND）防治内皮细胞损伤的机制及陷窝蛋白1（caveolin-1）和一氧化氮（NO）系统在其中的作用。方法：建立同型半胱氨酸(Hcy)损伤的人脐静脉内皮融合细胞（EAhy926细胞）模型,观察四逆汤的保护作用及其对NO系统和caveolin-1的影响。结果：Hcy加入后细胞生长缓慢,贴壁细胞数明显减少,NO浓度明显减低（P<0.05）,caveolin-1 mRNA和蛋白表达明显增强（P<0.05）,内皮型NO合酶(eNOS) mRNA和蛋白表达明显减弱（P<0.05）;四逆汤处理组贴壁细胞及细胞形态明显改善,NO浓度较Hcy模型组明显升高（P<0.05）,caveolin-1 mRNA和蛋白表达较Hcy模型组明显减弱（P<0.05）,eNOS mRNA和蛋白表达较Hcy模型组明显增强（P<0.05）,其中以四逆汤1.0 kg/L +Hcy 4.0 μmol/L组最明显。结论：Hcy可能通过增加caveolin-1表达和抑制eNOS表达而损伤人脐静脉内皮细胞,而四逆汤通过抑制caveolin-1表达和增加eNOS的表达拮抗Hcy对细胞的损伤。     

Stimulation with thromboxane A2 (TXA2) receptor agonist enhances ICAM-1, VCAM-1 or ELAM-1 expression by human vascular endothelial cells

A previous study reported that intercellular adhesion molecule-1 (ICAM-1) expression by human vascular endothelial cells (HUVEC) is augmented by intracellular signal transmission mainly through the protein kinase C (PKC) system stimulated by TXA₂ receptors. In the present study, we show that a TXA₂ receptor agonist, U46619, augments the expression of not only ICAM-1, but also vascular cell adhesion molecule-1 (VCAM-1) or endothelial leucocyte adhesion molecule-1 (ELAM-1) in HUVEC both at protein and mRNA levels. Pretreatment with SQ29,548 (a TXA₂ receptor antagonist) or PKC inhibitors greatly diminished the extent of U46619-induced mRNA accumulation and surface expression of the adhesion molecules. An inhibitor of nuclear factor κB (NF-κB) activation, PDTC, diminishes U46619-induced VCAM-1 mRNA accumulation. NAC, which inhibits NF-κB and activation protein 1 (AP-1) binding activity, inhibits the expression of ICAM-1 or ELAM-1 at protein and mRNA levels. These findings suggest that ICAM-1 or ELAM-1 expression of HUVEC stimulated via TXA₂ receptors is augmented by induction of NF-κB and AP-1 binding activity through the PKC system, and that VCAM-1 expression is augmented by induction of NF-κB binding activity.     

流体的不同流动方式对血管内皮细胞血管细胞粘附分子-1、核因子κB表达的影响

目的:探讨在低切应力时不同流态对粘附分子表达的影响。方法:置人脐静脉内皮细胞单层于平板流动腔内,经切应力0.2Pa层流或振荡流作用4h、18h,用组织免疫化学方法测其血管细胞粘附因子-1(VCAM-1)表达及核因子(NF-κB)核转位活性,原位杂交法检测VCAM-1mRNA表达。结果:在相同的低切应力作用下,层流组未见VCAM-1mRNA、VCAM-1有明显变化,而振荡流组则明显上调VCAM-1mRNA、VCAM-1表达分别为对照组2倍、2.4倍及NF-κB核转位活性明显高于对照。结论:VEC在低切应力作用下,振荡流明显上调VCAM-1表达,而层流无影响。     

Expression of intercellular adhesion molecule-1 and vascular cell adhesion molecule-1 in human crescentic glomerulonephritis

AIMS: In glomerulonephritis, intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) may play important roles in the formation of crescents. These studies are designed to evaluate the expression patterns of ICAM-1 and VCAM-1 in human crescentic glomerulonephritis and to determine the cellular origin of adhesion molecules in the crescentic lesions. METHODS AND RESULTS: We examined the expression of ICAM-1 and VCAM-1 proteins in renal biopsies with cellular (n=7), fibrocellular (n=9) or fibrous (n=4) crescentic glomerulonephritis, and six controls by immunohistochemistry. mRNA expression of ICAM-1 and VCAM-1 was further evaluated by RNA in-situ hybridization. Cytokeratin or CD68 immunohistochemistry was performed on the same sections, where in-situ hybridization had been carried out. In cellular crescents, ICAM-1 and VCAM-1 proteins were over-expressed to a similar extent. Of the three types of crescents, the extent of ICAM-1 immunopositivity was the greatest in the cellular crescents and decreased towards the fibrous crescents (P < 0.05). Yet the extent of VCAM-1 immunoreactivity was not different between the types. Fibrous crescents still contained some epithelial cells and showed only VCAM-1 expression. In the glomeruli with cellular or fibrocellular crescents, the extent of ICAM-1 immunopositivity in the glomerular tufts was significantly larger than that of VCAM-1 (P < 0.05). In an in-situ hybridization study, the mRNA expression patterns of ICAM-1 and VCAM-1 paralleled their protein expressions. A double-labelling study showed that the signal for ICAM-1 and VCAM-1 mRNAs was mainly present in cytokeratin-positive and CD68-negative cells in the crescentic lesions. CONCLUSIONS: These results suggest that glomerular parietal epithelial cells in cellular crescents up-regulate both ICAM-1 and VCAM-1, and that some epithelial cells retained in fibrous crescents persistently over-express VCAM-1, but not ICAM-1. They also suggest that ICAM-1 is involved in early leucocyte recruitment into glomeruli in crescentic glomerulonephritis.     

胰高血糖素样肽-1受体激动剂减轻高糖诱导的巨噬细胞炎性反应的机制

目的 探究胰高血糖素样肽-1受体(glucagon-like peptide-1 receptor,GLP-1R)激动剂(exendin-4)减轻高糖诱导的巨噬细胞炎性反应的机制.方法 小鼠单核巨噬细胞白血病细胞(RAW264.7)分为3组分别做以下处理:对照组(RAW264.7细胞正常培养基培养)、 高糖诱导组(RA...     

Inducible expression of vascular cell adhesion molecule-1 by vascular smooth muscle cells in vitro and within rabbit atheroma.

Vascular cell adhesion molecule-1 (VCAM-1), a mononuclear leukocyte adhesion molecule, is expressed in cultured vascular endothelial cells activated by cytokines and is induced in rabbit aortic endothelium in vivo within 1 week after initiation of an atherogenic diet. We now demonstrate that vascular smooth muscle cells can also express VCAM-1 in rabbit atherosclerotic lesions in vivo and in response to cytokines in vitro. Immunohistochemical staining of aortas from rabbits fed a 0.3% cholesterol-containing diet revealed that a portion of smooth muscle cells within intimal foam cell-rich lesions expressed VCAM-1. The intimal VCAM-1-expressing cells localized predominantly in regions above the internal elastic lamina. These VCAM-1-positive cells had the typical spindle shape of smooth muscle cells but had reduced alpha-actin expression in comparison to normal medial smooth muscle cells, and did not bear markers for endothelium, macrophages, and T cells. In culture, rabbit aortic smooth muscle cells expressed VCAM-1 mRNA and protein in a time- and concentration-dependent fashion when exposed to interferon-gamma or Gram-negative bacterial lipopolysaccharide. Cultured human vascular smooth muscle cells also expressed VCAM-1 mRNA and protein in response to lipopolysaccharide, interferon-gamma, and interleukin-4. The monokines interleukin-1 alpha and tumor necrosis factor-alpha did not induce VCAM-1 expression in either rabbit or human vascular smooth muscle cells. Inducible VCAM-1 expression by vascular smooth muscle cells in vivo during hypercholesterolemia and in vitro in response to certain cytokines suggests a broader range of VCAM-1 functions in vascular biology than heretofore appreciated.